<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>角色管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色按钮区域 -->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>

      <!-- 角色列表区域 -->
      <el-table :data="rolelist" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row
              v-for="(item1, index) in scope.row.children"
              :key="item1.id"
              :class="['bdbottom', index === 0 ? 'bdtop' : '', 'vcenter']"
            >
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag
                  style="margin: 7px"
                  closable
                  @close="removeRightById(scope.row, item1.id)"
                >
                  {{ item1.authName }}</el-tag
                >
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="19">
                <!-- 通过for 循环 嵌套渲染二级权限 -->
                <el-row
                  v-for="(item2, index2) in item1.children"
                  :key="item2.id"
                  :class="[index2 === 0 ? '' : 'bdtop', 'vcenter']"
                >
                  <el-col :span="6">
                    <el-tag
                      type="success"
                      style="margin: 7px"
                      closable
                      @close="removeRightById(scope.row, item2.id)"
                    >
                      {{ item2.authName }}
                    </el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>

                  <!-- 通过for循环嵌套三级权限 -->
                  <el-col :span="18">
                    <el-tag
                      v-for="item3 in item2.children"
                      :key="item3.id"
                      style="margin: 7px"
                      type="warning"
                      closable
                      @close="removeRightById(scope.row, item3.id)"
                    >
                      {{ item3.authName }}
                    </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
            <!-- <pre> {{ scope.row }} </pre> -->
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button size="mini" type="primary" icon="el-icon-edit"
              >编辑</el-button
            >
            <el-button size="mini" type="danger" icon="el-icon-delete"
              >删除</el-button
            >
            <el-button
              size="mini"
              type="warning"
              icon="el-icon-setting"
              @click="showSetRightDialog(scope.row)"
              >分配权限</el-button
            >
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 分配权限的对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="setRightDialogClosed"
    >
      <!-- 树形控件 -->
      <el-tree
        :data="rightslist"
        :props="treeProps"
        show-checkbox
        node-key="id"
        default-expand-all
        :default-checked-keys="defkeys"
        ref="treeRef"
      ></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allowRights"
          >确 定</el-button
        >
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //   所有角色列表数据
      rolelist: [],
      //控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      //所有权限的数据
      rightslist: [],
      //
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      //默认选中的节点Id的值
      defkeys: [],
       
      roleId: '',
    }
  },
  created() {
    this.getRolesList()
  },
  methods: {
    //获取所有角色的列表
    async getRolesList() {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) return this.$message.error('获取列表失败！')
      else {
        this.rolelist = res.data
        console.log(this.rolelist)
      }
    },
    //根据id删除对应的权限
    async removeRightById(role, rightId) {
      console.log(role, rightId)
      // 弹框提示用户是否要删除
      const confirmResult = await this.$confirm(
        '此操作将永久删除该文件, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)

      if (confirmResult !== 'confirm') return this.$message.info('取消了删除')
      else {
        const { data: res } = await this.$http.delete(
          `roles/${role.id}/rights/${rightId}`
        )
        console.log('需要删除的权限', res)
        if (res.meta.status !== 200)
          return this.$message.error('删除权限失败！ ')
        else role.children = res.data
      }
    },
    //展示分配权限的对话框
    async showSetRightDialog(role) {
        //调用后台接口roles/:roleId/rights 需要使用, 只有在弹框出来时候才能获得角色的id. 将其保存到变量中
        this.roleId = role.id
      //获取所有权限的数据
      const { data: res } = await this.$http.get('rights/tree')

      if (res.meta.status !== 200) return this.$message.error('获取权限失败！')
      else {
        // 后台获取到的权限数据保存到 rightslist中
        this.rightslist = res.data
        console.log(this.rightslist)

        this.getLeafKeys(role, this.defkeys)
        this.setRightDialogVisible = true
      }
    },
    //通过递归的形式， 获取角色下所有三级权限的id, 并保存到 defkeys数组中
    getLeafKeys(node, arr) {
      //如果当前 node节点不包含children树形， 则是三级节点
      if (!node.children) return arr.push(node.id)
      else {
        node.children.forEach(item => this.getLeafKeys(item, arr))
      }
    },
    //监听分配权限对话框的关闭事件, 解决数组id累加的问题
    setRightDialogClosed() {
      this.defkeys = []
    },
    //点击确认为角色分配权限
    async allowRights() {
        //拿到全选状态下和半选状态下所有key, ...语法使得2个数组合并成一个数组
        const keys = [
            ...this.$refs.treeRef.getCheckedKeys(),
            ...this.$refs.treeRef.getHalfCheckedKeys()
        ]
        // console.log(keys)
        const idStr = keys.join(',')
        // console.log(idStr)
        const {data: res} = await this.$http.post(`roles/${this.roleId}/rights`, {rids: idStr})
        if (res.meta.status !==200) return this.$message.error('分配权限失败')
        else {
            this.$message.success('分配权限成功')
            this.getRolesList()
            this.setRightDialogVisible = false
        }

    },
  }
}
</script>

<style scoped>
.bdbottom {
  border-bottom: 1px solid #eeeeee;
}

.bdtop {
  border-top: 1px solid #eeeeee;
}

.vcenter {
  display: flex;
  align-items: center;
}
</style>
